Uplink Power Control for Satellite Networks
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Solution Overview
Problem
High-frequency satellite communication systems face significant challenges in maintaining signal integrity due to atmospheric attenuation, particularly in Q/V bands, which leads to increased fade dynamics during rain events, compromising link availability and requiring complex fade mitigation techniques.
Innovation Solution
An 'interference aware' Uplink Power Control method that optimizes the operating point of the High-Power Amplifier by determining an optimal Output Back Off value to maximize the Signal over Noise plus total interference ratio, using a variable gain amplifier to maintain optimal performance independent of uplink power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If higher frequency bands (Q/V band) are used to increase available bandwidth and reduce gateway数量, then the available bandwidth increases and gateway cost decreases, but atmospheric attenuation increases significantly
Solution Approach 1:
The patent implements dynamic uplink power control that continuously adjusts the output power of ground-based High Power Amplifiers based on real-time atmospheric conditions. The system modifies transmitted power levels in response to changing attenuation conditions, enabling adaptive operation that maintains link reliability while exploiting the increased bandwidth available in Q/V bands
Solution Approach 2:
The system changes the operating parameters of ground-based amplifiers by dynamically adjusting output power and Output Back Off (OBO) levels. By modifying these parameters in response to atmospheric conditions, the system compensates for increased attenuation at higher frequencies while maintaining efficient bandwidth utilization
2Reliability
If traditional uplink power control is used to compensate for atmospheric attenuation, then link availability is maintained, but intermodulation interference increases and channel capacity is reduced
Solution Approach 1:
The patent introduces a sophisticated power control method that dynamically adjusts multiple parameters including output power and Output Back Off (OBO) levels. By optimizing these parameters based on atmospheric conditions and interference measurements, the system maintains link availability while minimizing intermodulation interference generation in ground-based amplifiers
Solution Approach 2:
The system implements feedback mechanisms that monitor link conditions and interference levels, then use this information to adjust power control parameters. This closed-loop approach enables the system to maintain optimal operation by compensating for atmospheric attenuation while keeping intermodulation interference below harmful thresholds
3Power
If full compensation of atmospheric attenuation is applied, then received signal power is maintained, but Output Back Off decreases and intermodulation products increase
Solution Approach 1:
The patent applies partial compensation rather than full compensation of atmospheric attenuation. By providing just enough power adjustment to maintain acceptable signal levels without complete compensation, the system avoids driving ground-based amplifiers into deep backoff conditions that would generate excessive intermodulation products
Solution Approach 2:
The system dynamically changes the Output Back Off parameter based on atmospheric conditions, transitioning from fixed backoff operation to adaptive backoff control. This parameter adjustment enables the system to maintain received signal power at acceptable levels while preventing excessive intermodulation product generation
Data Source
AI summary
An Uplink Power Control method of adjusting an operating point of a High-Power Amplifier (HPA) of a ground-to-satellite emitter (GWj, GWk, GWl) as a function of propagation attenuation, characterized in that the method includes the steps of: a) determining an optimal Output Back Off value of the High-Power Amplifier which, for an operational propagation attenuation level, maximizes a Signal over Noise plus total interference ratio at the satellite taking into account contributions from cochannel and cross-polar interferences, intermodulation interferences and thermal noise; and b) setting the operating point of the High-Power Amplifier at the optimal Output Back Off value. A ground-to-satellite emitter comprising a High-Power Amplifier (HPA), a control means (PROC) for adjusting an operating point of said High-Power Amplifier by carrying out such a method.